RECON: TNO occultation with 95DB2

Event between 95DB2 and star UC4-496-056898 with event index number of 115030

Geocentric closest approach at 2018/04/11 17:10:49 UTC

J2000 position of star is 10:58:10.8 +09:09:32
Equinox of date position of star is 10:59:02.0 +09:04:16
Stellar brightness R=13.9
Star is 167 degrees from the moon. Moon is 20% illuminated.
TNO apparent brightness V=23.8

TNO is 41.0 AU from the Sun and 40.2 AU from the Earth.
The TNO is moving 18.4 km/sec on the sky relative to the star, or, 2.3 arcsec/hr.
The 1-sigma error in the time of the event is 363 seconds.
The 1-sigma cross-track error in the shadow position is 3616 km.

The TNO has an absolute magnitude Hv=7.6
Diameter=182.8 km assuming a 5% albedo -- 9.9 sec chord
Diameter=74.6 km assuming a 30% albedo -- 4.1 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 95DB2, (2018/04/11 17:11UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:20.6 +11:52:38  1.3 12.56 179
68Del Leo      11:15:04.7 +20:25:24  2.6 12.00 162
63Chi Leo      11:05:57.6 +07:14:13  4.6  2.49 165
PPM 157450     11:03:30.0 +09:04:27  7.7  1.08 166
PPM 157377     10:58:46.5 +08:55:12  9.1  0.17 167
PPM 157389     10:59:34.8 +09:02:24 10.9  0.11 167
95DB2          10:59:08.0 +09:03:38 13.9       167
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Event circumstances last updated at 2016/05/01 17:08:03 UT

Marc W. Buie, Southwest Research Institute

RECON